Tear lettuce and spinach into bite-sized pieces. Fry and drain bacon, reserving drippings. Saute onion in drippings. Add vinegar, sugar, salt, pepper and mustard. Cook until sugar dissolves.

Stir a small amount of hot mixture into eggs; stir eggs into hot mixture. Simmer until thick, stirring constantly. Pour over salad greens, toss lightly. Serve immediately.

This recipe for Hot Bacon Salad serves/makes 8.